Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/worker-testharness.js

 /*
  * worker-test-harness should be considered a temporary polyfill around
  * testharness.js for supporting Service Worker based tests. It should not be
  * necessary once the test harness is able to drive worker based tests natively.
  * See https://github.com/w3c/testharness.js/pull/82 for status of effort to
  * update upstream testharness.js. Once the upstreaming is complete, tests that
  * reference worker-test-harness should be updated to directly import
  * testharness.js.
  */
 
@@ skipping 29 matching lines @@
 // E.g.:
 //    cache_test(function(cache) {
 //      // Do something with |cache|, which is a Cache object.
 //    }, "Some Cache test");
 function cache_test(test_function, description) {
   promise_test(function(test) {
       return create_temporary_cache(test)
         .then(test_function);
     }, description);
 }